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I had a big leak due to the dreaded washer pipes broken, and the left side was flooded withe a few cm of washer fluid.
Washer pipes have been replaced, and will take weeks to all dry out completely.
Problem I still have is that the MMI 2 G is still not working.
I have the Bose option, DVD Nav, BT phone module.
Initially completely dead, but now the Audi MMI system screen comes up for a few seconds and then goes black again.
-I checked all fuses, and they seem to be ok.
-got the amp out, and made an optical loop.
-tried reset.
- also got the BT phone ECU out from underneath the left passenger seat, which was very wet!
So looks like this is the problem.

But I took the BT ECU out and connected the optical cables in a loop too.
Unfortenately MMI is still not working.( only MMI Audi start up screen for a few seconds, then black screen)

Only thing I noticed is that the optical cable going to the BT ECU is flashing the red light, but the optical cable to the Bose amp in the left back is not showing the red light.
So I don't really know what to do/check now?

I'm not an expert here but do have some experience with the fibre side of things, which is what the cable with the red light on is that you refer to. Fibre is a loop system so any break in that causes all devices in that loop to stop functioning.

So if any of the fibre cables in the AMP, NAV, CD Changer etc are not properly in or broken nothing will work.

Also I'm not sure if the above is true should any device loose power.

Finally, water and electricity do not mix so you need to throw that into the mix here, could be one or more units are now faulty as a result.

Are you in a position to get the codes read, that may help identify the device(s) in question.

If you could find a way to bridge out each device in turn (you'd need some kind of cable to do that) you could work on eliminating each in turn until you found the faulty one.

It's the optical cable going into the BT ECU which is where the red light is coming out.
So, I thought that in that case it would be logical that there would be a red light coming out of the optical cable for the amp too.

I forgot to meantion that, I brought the car to a Audi "specialist" who solved the leaking washer hoses, and also tried the VCDS test.
but he said that ot was completely dead, and so he couldn't find out which modules where broken within the MMI system.
That's why I am trying to find out one by one.

I openend the BT ECU, which was soaking wet and looks like that's gone for sure.
I thought that if you do a bridge loop by connecting the 2 optical cables together ,so that you bypass the BT ECU to see if the MMI comes back to life.
so far, no luck!

I hope someone can help me further, and otherwise I will have to bring it to the Audi dealer I guess.....

It'll be the main radio controller unit that's died. Same happened to mine....though its a facelift one so all in one box now. Have a look on eBay. My symptoms were identical...came on for a few seconds then off.....all buttons by gear stick refused to light up. Changes the main unit and all back to normal after removing component protection.

Like Andy said you must look at all modules/dry the elec.connections/bridge them...

Like Neil said you maybe getting the issue due to the MMI rack in boot being wrecked by water...

Have you bridged all connections fibre optical connections on modules which have been water logged? ref page 7 pf SSP 326 top right... if you put Adobe reader in two page view and view 6 & 7 together...

Thanks for the replies!
I will have a further look when I have some more time, and most of the car is dried out.
Thank's for the PDF's!
I have disconnected the amp( which didn't look bad inside) and the BT phone ECU (was covered in water) and bridged both of them.
unfortenately I still only get the Audi MMI start up screen for a few seconds.

As Neil said I will have a look at the radio controller next.
The Nav DVD module is powered and I can get the dvd in and out.
Also the cd changer in the clove box is operating normally.

Now if you ref the MMI layout, the fibre optic is linking the modules highlighted in the SSP, so when you view cable connection one side will be live with red light other not (you can see direction of data/light flow by arrow on the plug)...

Yes , that's what I thought too.
if there's no optical red light( data in) going into the amp there must be an optical breakage somewhere before.

- Someone any idea where that can be?

I have the car in the garage now to dry out completely.
I will buy a more professional optical bridge so I can leave the BT phone ECU out of the loop.
( I have connected the 2 optical wires needly together with tape to make the loop which isn't the best)

Thanks for all the replies so far!
Unfortenately the Audi specialist couldn't read anything out with VCDC ,gupsterg, otherwise it would have been easy.
I just got an email back from Audi that I can buy the loop bridge direct from the dealer in my town for £10.
So that' s what I am gonna do next when I have a few days off work.

- maybe someone can tell me this?: I did an own loop connecting the 2 optical cables together from the BT phone ECU under the front left seat and the was a red light on and off from the optical in.
I think the next in line is the amplifier and there was no red optical light from the ingoing cable.
(both PHone ECU and amp disconnected)
Does this perhaps mean there is no good loop connection with the optical in and out from the phone ecu so the optical light will never reach the amp?

I'll keep you posted, as I know this is a very common problem with the A6 Avant's......

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